Band-like transport in surface-functionalized highly solution-processable graphene nanosheets
Wang, S. Chia, P.-J. Chua, L.-L. Zhao, L.-H. Png, R.-Q. Sivaramakrishnan, S. Zhou, M. Goh, R.G.-S. Friend, R.H. Wee, A.T.-S.
Zhao, L.-H.
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Abstract
Substochiometric Graphite oxide (GO) nanosheets were surface-functionalized and purified to show excellent dispersity at the single-sheet level in organic solvents, sufficient for spin-coating and printing onto various substrates. It is found that the sheets are ca. 18-Å thick due to the combined thickness of the basal plane and the alkyl chains. No measurable dc conductance is obtained for anneal temperature below 180°C, which suggests the film conductivity less than 1×10-1 S cm-1. The sp 2 fraction of carbon atoms gives the fraction of carbons connected into the π-electron network responsible for the electronic and optical properties of the nanosheets. It is also found that mobile charge carriers are field-induced and confined on the most extended sections of these graphenites.
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Advanced Materials
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Date
2008-09-17
DOI
10.1002/adma.200800279
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Article